The London Underground roundel logo, originally known as the ‘bar and circle’, was first used in 1908 at St James’s Park station near Buckingham Palace, while the Tube map in its current form was designed by engineer Harry Beck in 1933.

Then, there’s Batou (Pilou Asbæk), Major’s partner in Section 9, who, after losing the use of his eyes in an explosion, is soon kitted out with a replacement: two little metal roundels, complete with X-ray vision.

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Origin and Etymology of roundel

Middle English, from Anglo-French rondel, roundel, from rund round — more at round